28515288 has 32 divisors (see below), whose sum is σ = 73589760. Its totient is φ = 9198240.

The previous prime is 28515269. The next prime is 28515353. The reversal of 28515288 is 88251582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18420 + ... + 19907.

It is an arithmetic number, because the mean of its divisors is an integer number (2299680).

Almost surely, 2^28515288 is an apocalyptic number.

It is an amenable number.

28515288 is an abundant number, since it is smaller than the sum of its proper divisors (45074472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28515288 is a wasteful number, since it uses less digits than its factorization.

28515288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38367 (or 38363 counting only the distinct ones).

The product of its digits is 51200, while the sum is 39.

The square root of 28515288 is about 5339.9707864369. The cubic root of 28515288 is about 305.5103450807.

The spelling of 28515288 in words is "twenty-eight million, five hundred fifteen thousand, two hundred eighty-eight".